Add integrated debugger DevTools core

[bjdodson-openai]

Description

Adds the top-level browser DevTools surface, bounded tree model, Owl and Chromium clients, loopback routes, and package integration.

• Projects untrusted runtime values through bounded, non-recursive presentation helpers.
• Enforces loopback and origin policy for browser routes.
• Packages the panel assets and client modules in the CLI distribution.

Type of Change

• Bug fix (non-breaking change that fixes an issue)
• Documentation improvement
• Performance optimization
• Test improvement
• Other (new debugger capability)

Testing

• Tests pass locally (bazel test //...)
• Added/updated tests for changes (if applicable)
• Tested on multiple platforms (iOS/Android/Web/macOS as applicable)
• Manual testing performed (describe below)

Testing Details

• Incremental branch: Focused DevTools coverage passed 101/101; integrated CLI 230/230, strict TypeScript, package dry-run, and production build passed.
• Assembled debugger stack: npm test passed 436/436; the CLI production build passed.
• Focused //src/valdi_modules/src/valdi/web_renderer:test passed.
• bazel query //... passed.
• The broad Valdi suite reproduced the established 12 unrelated failures; all new debugger specs passed.

Checklist

• Code follows project style guidelines
• Documentation updated (if needed)
• No breaking changes (or documented in description)
• Commit messages follow conventional format
• No secrets, API keys, or internal URLs included

Related Issues

Relates to #154

Additional Context

Stack 5/22. Stacked on #157 (bjd/debugger-web-bridge). Review this PR as the single incremental commit 5f768c6f against that base; do not merge it before its parent.

[github-actions]

📊 PR Size: size/XL

Total changes: 6888 lines (26 files)

Top files changed:

• npm_modules/cli/src/debugger/debuggerTreeModel.spec.ts: +896 -0
• npm_modules/cli/src/debugger/server.ts: +816 -47
• npm_modules/cli/debugger/devtools-panel.js: +742 -0
• npm_modules/cli/src/utils/owlCdpClient.spec.ts: +662 -0
• npm_modules/cli/debugger/devtools-panel.css: +610 -0
• npm_modules/cli/debugger/debugger-tree-model.js: +539 -0
• npm_modules/cli/src/debugger/server.spec.ts: +434 -1
• npm_modules/cli/src/utils/chromiumDevToolsClient.ts: +324 -0
• npm_modules/cli/src/utils/owlCdpClient.ts: +310 -0
• npm_modules/cli/src/utils/hermesClient.ts: +81 -205

...and 16 more files

_{Size calculated as additions + deletions. Labels: XS (<10), S (<50), M (<250), L (<1000), XL (1000+)}

[github-actions]

⚠️ Bazel & CI Test Results

Test Suite	Result
Valdi Smoke Tests	❌ failure
valdi_web Integration Test	✅ success
Linux: Build & Export	✅ success
Linux: C++ Tests	✅ success
Test Coverage Delta	✅ success
macOS: C++ & Platform Tests	❌ failure
API Surface Check	✅ success
Linux: Registry Validation	✅ success
Snapshot Tests	✅ success
Linux: Module Tests	✅ success
Linux: Hotreload Smoke	✅ success
Linux: Build Compiler	✅ success

Some tests failed. Please check the workflow logs for details.

🚀 Bazel remote cache is now enabled - future builds will be faster!

_{Workflow: Valdi CI}